CN220147243U - Vehicle-mounted bracket - Google Patents

Abstract

The utility model discloses a vehicle-mounted bracket, wherein: the vehicle-mounted bracket comprises a bracket seat, one end of the bracket seat is provided with a connecting part, and the other end of the bracket seat is provided with a first accommodating groove and a second accommodating groove; the first magnetic piece is movably arranged in the first accommodating groove and can move in the depth direction in the first accommodating groove; the second magnetic piece is fixedly arranged in the second accommodating groove; the reset mechanism is arranged in the first accommodating groove and is used for resetting the first magnetic piece; and the cover plate is covered on the first accommodating groove and the second accommodating groove. The first magnetic piece and the second magnetic piece form strong magnetic adsorption on the electronic equipment together; when separating electronic equipment, first magnetic part receives canceling release mechanical system's restoring force influence to moving to the one side that keeps away from electronic equipment gradually in the activity space, makes magnetism inhale the effort and weakens fast, reaches the effect of getting well.

Description

Vehicle-mounted bracket

Technical Field

The utility model relates to the technical field of vehicle accessories, in particular to a vehicle-mounted bracket.

Background

The vehicle-mounted support is a mobile phone clamping tool and is used for clamping a mobile phone during driving so as to operate the mobile phone, however, most of vehicle-mounted supports on the market are in a clamping mode, and the clamping position needs to be aligned for placement, so that the vehicle-mounted support is very inconvenient for a driving user.

In order to solve the problems, a magnetic support is arranged, a magnetic piece is generally arranged in the magnetic support to adsorb a mobile phone, the magnetic support does not need user alignment, and the mobile phone is directly placed at a magnetic end of the magnetic support. In order to ensure the fixing effect of the magnetic support, the magnetic force of the magnetic support is usually required to be designed to be large, but the magnetic force is large to cause a new problem that the mobile phone is not easy to take, and a user is required to apply large force to take the mobile phone from the magnetic support.

Disclosure of Invention

The utility model aims to provide a vehicle-mounted support and aims to solve the problem that a vehicle-mounted magnetic support is not easy to take a mobile phone.

The embodiment of the utility model provides a vehicle-mounted bracket, wherein: the bracket comprises a bracket seat, wherein one end of the bracket seat is provided with a connecting part, and the other end of the bracket seat is provided with a first accommodating groove and a second accommodating groove; the first magnetic piece is movably arranged in the first accommodating groove and can move in the depth direction in the first accommodating groove; the second magnetic piece is fixedly arranged in the second accommodating groove; the reset mechanism is arranged in the first accommodating groove and is used for resetting the first magnetic piece; and the cover plate is covered on the first accommodating groove and the second accommodating groove.

Specifically, the reset mechanism is an elastic piece, one end of the elastic piece is connected to the bottom of the first accommodating groove, the other end of the elastic piece is connected to the first magnetic piece, and when the first magnetic piece moves towards the direction away from the bottom of the first accommodating groove under the action of external force, the elastic piece is in a stretching state.

Specifically, the reset mechanism is a third magnetic piece, the third magnetic piece is arranged at the bottom of the first accommodating groove, and the third magnetic piece and the first magnetic piece are magnetically attracted.

Specifically, the magnetic attraction force between the third magnetic piece and the first magnetic piece is smaller than the magnetic attraction force between the first magnetic piece and the object magnetically attracted on the bracket seat.

Specifically, the second accommodating groove is close to the edge of the bracket seat relative to the first accommodating groove.

Specifically, a buffer pad is arranged between the first magnetic piece and the cover plate, and/or a buffer pad is arranged between the first magnetic piece and the bottom of the first accommodating groove.

Specifically, the first magnetic piece is an annular magnetic piece, and the first accommodating groove is an annular accommodating groove; or,

the first magnetic pieces are arranged in a plurality, and the first accommodating grooves are correspondingly arranged in a plurality and are annularly distributed on the support seat at intervals.

Specifically, the magnetic pole of the first magnetic part facing the cover plate is opposite to the magnetic pole of the second magnetic part facing the cover plate, and the magnetic pole of the first magnetic part far away from the cover plate is opposite to the magnetic pole of the second magnetic part far away from the cover plate.

Specifically, the magnetic force of the second magnetic member is smaller than that of the first magnetic member.

Specifically, the second magnetic piece is an annular magnetic piece, and the second accommodating groove is an annular accommodating groove; or,

the second magnetic pieces are arranged in a plurality, and the second accommodating grooves are correspondingly arranged in a plurality and are annularly distributed on the support seat at intervals.

The embodiment of the utility model provides a vehicle-mounted support, which is characterized in that a first magnetic part and a second magnetic part are arranged to magnetically attract electronic equipment, a movable space in the depth direction is formed in a first accommodating groove of the first magnetic part, the second magnetic part is fixedly arranged in a second accommodating groove, when the electronic equipment is placed on a support seat, the second magnetic part is subjected to the magnetic attraction force of the electronic equipment to primarily attract the electronic equipment, the first magnetic part is also subjected to the magnetic attraction force of the electronic equipment, and is magnetically attracted to one side close to the electronic equipment in the movable space, so that the first magnetic part and the second magnetic part form strong magnetic attraction to the electronic equipment, and further the electronic equipment is stably attracted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of one embodiment of a vehicle mount provided by the present utility model;

FIG. 2 is a schematic structural diagram of an embodiment of a vehicle-mounted bracket provided by the utility model;

FIG. 3 is a cross-sectional view of A-A in FIG. 2;

fig. 4 is a schematic structural diagram of another embodiment of the vehicle-mounted bracket provided by the utility model;

FIG. 5 is a cross-sectional view of B-B in FIG. 4;

FIG. 6 is an exploded view of another embodiment of the vehicle mount provided by the present utility model;

FIG. 7 is a cross-sectional view of the vehicle mount of the present utility model without the magnetic member;

FIG. 8 is a schematic diagram of the structure of the vehicle-mounted bracket without the magnetic member;

FIG. 9 is a magnetic pole distribution diagram of a first magnetic member and a second magnetic member according to the present utility model;

fig. 10 is a schematic diagram illustrating attraction between a first magnetic member and a second magnetic member according to the present utility model.

The figure identifies the description:

1. a support seat; 11. a first accommodating groove; 12. a second accommodating groove; 13. a connection part;

2. a first magnetic member;

3. a second magnetic member;

4. an elastic member;

5. a third magnetic member;

6. and a cover plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, 2 and 3, an embodiment of the present utility model provides a vehicle-mounted bracket, which includes a bracket seat 1, wherein one end of the bracket seat 1 is provided with a connecting portion 13, and the other end of the bracket seat 1 is provided with a first accommodating groove 11 and a second accommodating groove 12; the first magnetic piece 2 is movably arranged in the first accommodating groove 11, and the first magnetic piece 2 can move in the depth direction in the first accommodating groove 11; the second magnetic piece 3, the second magnetic piece 3 is fixedly arranged in the second accommodating groove 12; the resetting mechanism is arranged in the first accommodating groove 11 and is used for resetting the first magnetic piece 2; the cover plate 6 is covered on the first accommodating groove 11 and the second accommodating groove 12.

In this embodiment, the vehicle-mounted bracket at least includes a connecting portion 13, a first magnetic member 2, a second magnetic member 3, a first accommodating groove 11 and a second accommodating groove 12 for accommodating the first magnetic member 2 and the second magnetic member 3, a reset mechanism for resetting the first magnetic member 2, and a cover plate 6 covering the first accommodating groove 11 and the second accommodating groove 12, wherein one end of the connecting portion 13 away from the first accommodating groove 11 is used for being fixed on a vehicle or a corresponding accessory, when a user needs to use the electronic device, the bracket seat 1 can be fixed at a fixable position through the connecting portion 13, so as to facilitate the operation of the electronic device, the electronic device can be placed on the cover plate 6, the first accommodating groove 11 and the second accommodating groove 12 under the cover plate 6 can accommodate the first magnetic member 2 and the second magnetic member 3, the first magnetic member 2 has a movable space in the first accommodating groove 11 along the depth direction, the second magnetic member 3 has no movable space in the second accommodating groove 12, and the second accommodating groove 12 is close to the edge of the bracket seat 1. The movable space can ensure that the first magnetic part 2 moves to the side close to the electronic equipment when receiving the magnetic attraction force of the electronic equipment, thereby enhancing the attraction force. Through the strong magnetic attraction formed by the first magnetic part 2 and the second magnetic part 3, the electronic equipment on the cover plate 6 can be attracted stably, so that the electronic equipment does not fall off. In this embodiment, the support seat 1 can be placed vertically, and the first accommodating groove 11 is arranged upwards, so that the movable space is vertical or has a certain inclination angle relative to the vertical, and the first magnetic part 2 can reset to one side, far away from the electronic equipment, of the movable space by utilizing self gravity when the magnetic attraction acting force is smaller, so that the magnetic attraction acting force is weakened rapidly. In order to place the support seat 1 at more angles and ensure that the first magnetic part 2 can be reset, a reset mechanism is additionally arranged, when the electronic equipment is separated, the electronic equipment is firstly separated from the second magnetic part 3, the first magnetic part 2 is affected by the acting force of the reset mechanism to gradually move to one side far away from the electronic equipment in an active space, and when the first magnetic part 2 cannot continuously move, the electronic equipment is separated from the first magnetic part 2, and at the moment, the first magnetic part 2 is reset. In the whole separation process, the electronic equipment and the vehicle-mounted support can be separated only by ensuring that the separation acting force is larger than the magnetic attraction acting force of the electronic equipment and the second magnetic piece 3, so that the electronic equipment is adsorbed by the large magnetic force, and the labor-saving effect is ensured when the electronic equipment is separated.

In an embodiment, as shown in fig. 3, the reset mechanism is an elastic member 4, one end of the elastic member 4 is connected to the bottom of the first accommodating groove 11, the other end of the elastic member is connected to the first magnetic member 2, and when the first magnetic member 2 moves away from the bottom of the first accommodating groove 11 under the action of an external force, the elastic member 4 is in a stretched state.

In the present embodiment, when the first magnetic member 2 is not magnetically attracted to the electronic device, the elastic member 4 is in an initial state, and no force is applied to the first magnetic member 2 and is balanced with the first magnetic member 2. In the initial state, a certain distance is reserved between the first magnetic piece 2 connected with the other end of the elastic piece 4 and the cover plate 6; when the first magnetic element 2 magnetically attracts the electronic device, the first magnetic element 2 moves in a direction close to the cover plate 6 under the influence of the magnetic attraction force of the electronic device, so as to attract the electronic device, and since one end of the elastic element 4 is connected to the bottom of the first accommodating groove 11, the elastic element 4 is stretched, and at this time, the elastic element 4 is in a stretched state, and a larger elastic restoring force is accumulated. When the user takes off the electronic equipment, the magnetic attraction force of the first magnetic part 2 and the electronic equipment becomes weak, and at the moment, the elastic restoring force of the elastic part 4 is larger than the magnetic attraction force, so that the other end of the elastic part 4 can pull back the first magnetic part 2, thereby resetting the first magnetic part 2, and in the resetting process, the magnetic attraction force of the first magnetic part 2 and the electronic equipment becomes further weak due to the fact that the first magnetic part 2 moves in the direction away from the electronic equipment, so that the user can conveniently take the mobile phone without spending larger force.

In an embodiment, as shown in fig. 4, 5 and 6, the reset mechanism is a third magnetic member 5, the third magnetic member 5 is disposed at the bottom of the first accommodating groove 11, and the third magnetic member 5 magnetically attracts the first magnetic member 2.

In this embodiment, the elastic member 4 may be replaced by a non-elastic member, such as the third magnetic member 5, where the third magnetic member 5 is mainly used to attract the first magnetic member 2. When the first magnetic part 2 attracts the electronic equipment magnetically, the attraction force between the first magnetic part 2 and the electronic equipment is larger than the attraction force between the first magnetic part 2 and the third magnetic part 5, so that the first magnetic part 2 is attracted to one side close to the electronic equipment, when the electronic equipment is taken away, the attraction force between the electronic equipment and the first magnetic part 2 is weakened, when the attraction force between the first magnetic part 2 and the third magnetic part 5 is larger than the attraction force between the electronic equipment and the first magnetic part 2, the first magnetic part 2 moves to one side far away from the electronic equipment under the action of the third magnetic part 5, and the attraction force between the first magnetic part 2 and the electronic equipment is further weakened, so that a user can take a mobile phone conveniently without spending large force.

Further, one end of the first magnetic member 2 magnetically attracts the magnet of the electronic device, and the other end magnetically attracts the third magnetic member 5. Assuming that the magnetic pole of the magnet of the electronic device is N, the magnetic pole face of the first magnetic element 2 close to the electronic device is S, the magnetic pole face of the first magnetic element 2 close to the third magnetic element 5 is N, and the magnetic pole of the third magnetic element 5 is S.

In an embodiment, the magnetic attraction force between the third magnetic member 5 and the first magnetic member 2 is smaller than the magnetic attraction force between the first magnetic member 2 and the object magnetically attracted on the bracket base 1.

In this embodiment, when the first magnetic element 2 does not generate the magnetic attraction electronic device, the first magnetic element 2 is at the initial position and has a certain distance from the cover plate 6; when the first magnetic member 2 magnetically attracts the object (i.e., the electronic device) on the stand 1, if the magnetic attraction force between the third magnetic member 5 and the first magnetic member 2 is greater than the magnetic attraction force between the first magnetic member 2 and the object magnetically attracted on the stand 1, the first magnetic member 2 may not move in the direction of the cover plate 6 or the moving distance may be insufficient due to the small force of moving toward the cover plate 6. Therefore, the magnetic attraction force between the third magnetic piece 5 and the first magnetic piece 2 is smaller than the magnetic attraction force between the first magnetic piece 2 and the object attracted on the bracket seat 1.

In an embodiment, a buffer pad is provided between the first magnetic member 2 and the cover plate 6, and/or a buffer pad is provided between the first magnetic member 2 and the bottom of the first accommodating groove 11.

In this embodiment, when the electronic device is placed on the stand 1, the first magnetic member 2 is moved in the movable space toward the side close to the electronic device by the magnetic attraction force of the electronic device until the cover plate 6 is abutted, if the magnetic attraction force is large, the first magnetic member 2 will impact the cover plate 6, and the service life of the two will be affected for a long time, so that the buffer pad is added between the two to buffer the impact force, thereby playing a role of protection. Similarly, when the electronic device is separated, the first magnetic part 2 moves towards the bottom of the first accommodating groove 11, and if the speed is high, the first magnetic part also impacts the bottom of the first accommodating groove 11, and the service lives of the first magnetic part and the second magnetic part are also affected for a long time, so that a buffer pad can be added between the first magnetic part and the second magnetic part to buffer impact force, and the protection effect is achieved. The material of the buffer pad is preferably a material that does not affect the magnetic attraction force between the first magnetic member 2 and the electronic device.

In addition, when the elastic member 4 is disposed between the first magnetic member 2 and the bottom of the first accommodating groove 11, the elastic member 4 itself has a buffering function, so that no buffer pad may be disposed therebetween. When the third magnetic element 5 is disposed between the first magnetic element 2 and the bottom of the first accommodating groove 11, a buffer pad may be disposed between the first magnetic element 2 and the third magnetic element 5 to protect the two.

The cushion pad can be arranged on one of the two parts needing to be buffered, and the cushion pad can be arranged on the contact surfaces of the two parts at the same time.

In one embodiment, as shown in fig. 7 and 8, the first magnetic member 2 is an annular magnetic member, and the first accommodating groove 11 is an annular accommodating groove; or,

the first magnetic parts 2 are arranged in a plurality, and the first accommodating grooves 11 are correspondingly arranged in a plurality and are annularly distributed on the bracket seat 1 at intervals.

In this embodiment, the first magnetic member 2 is provided with an annular magnetic member, so that the electronic devices placed in the annular range can be magnetically attracted, the first magnetic member 2 can be utilized to a greater extent, and the corresponding first accommodating groove 11 also needs to be provided with an annular shape for accommodating the first magnetic member 2; alternatively, in order to save the first magnetic members 2, a plurality of small first magnetic members 2 may be provided, and a plurality of corresponding first accommodating grooves 11 are also required to be provided for accommodating the first magnetic members 2, and are distributed on the bracket base 1 at annular intervals, for example, uniformly spaced along the circumferential direction of the bracket base 1.

In one embodiment, as shown in fig. 7 and 8, the second magnetic member 3 is an annular magnetic member, and the second accommodating groove 12 is an annular accommodating groove; or,

the second magnetic parts 3 are provided in plurality, and the second accommodating grooves 12 are correspondingly provided in plurality and are annularly distributed on the bracket seat 1 at intervals.

In this embodiment, the second magnetic member 3 is provided with an annular magnetic member, so that the electronic devices placed in the annular range can be magnetically attracted, the second magnetic member 3 can be utilized to a greater extent, and the second accommodating groove 12 is also required to be provided with an annular shape for accommodating the second magnetic member 3 correspondingly; alternatively, in order to save the second magnetic members 3, a plurality of small second magnetic members 3 may be provided, and a plurality of corresponding second accommodating grooves 12 are also required to be provided for accommodating the second magnetic members 3, and are distributed on the bracket base 1 at annular intervals, for example, uniformly spaced along the circumferential direction of the bracket base 1. Therefore, the double-ring magnetic attraction structure is formed on the support seat 1, the outer ring is the second magnetic part 3 which is not movable, the inner ring is the first magnetic part 2 which is movable, and the effects of stably adsorbing the electronic equipment and conveniently taking the electronic equipment by a user are achieved.

In one embodiment, as shown in fig. 8, the second accommodating groove 12 is close to the edge of the bracket seat 1 relative to the first accommodating groove 11.

In this embodiment, when the user picks up the object placed on the stand 1, the user mostly pulls out the object from the outside, that is, breaks the edge of the object with one side by using a finger, so a magnetic member (that is, the second magnetic member 3) with small magnetic force and still capable of adsorbing the object needs to be disposed in the groove near the edge, so that the user can separate the object from the outside without consuming a large force.

In an embodiment, the magnetic force of the second magnetic member 3 is smaller than the magnetic force of the first magnetic member 2.

In this embodiment, the magnetic force of the second magnetic member 3 is smaller than that of the first magnetic member 2, so as to facilitate the user to separate the electronic device with smaller separation force.

In addition, in combination with the fact that the second accommodating groove 12 is close to the edge of the bracket seat 1 relative to the first accommodating groove 11, an additional benefit that the magnetic force of the second magnetic part 3 is smaller than that of the first magnetic part 2 is that when a user takes the electronic equipment, the electronic equipment can be taken by a slightly tilted gesture, at the moment, the magnetic force of the second magnetic part 3 is weaker, the user firstly separates the second magnetic part 3 when taking the electronic equipment, the electronic equipment and the cover plate 6 form an included angle, the magnetic force of the first magnetic part 2 is stronger, and the elastic part 4 or the third magnetic part 5 is arranged at the bottom of the first magnetic part 2 to pull the first magnetic part 2 in the opposite direction, so that the electronic equipment can be attracted strongly by the arrangement, but the electronic equipment is easy to take. The way to realize that the magnetic force of the second magnetic member 3 is smaller than the magnetic force of the first magnetic member 2 may be: the second magnetic element 3 is designed smaller or fewer in number than the first magnetic element 2.

In an embodiment, as shown in fig. 9 and 10, the magnetic pole of the first magnetic member 2 facing the cover plate 6 is opposite to the magnetic pole of the second magnetic member 3 facing the cover plate 6, and the magnetic pole of the first magnetic member 2 facing away from the cover plate 6 is opposite to the magnetic pole of the second magnetic member 3 facing away from the cover plate 6.

In this embodiment, the first magnetic member 2 and the second magnetic member 3 are opposite to the magnetic poles facing the cover plate 6, and the first magnetic member 2 and the second magnetic member 3 are opposite to the magnetic poles facing away from the cover plate 6. Specifically, assuming that the magnetic pole surface of the first magnetic element 2 facing the cover plate 6 is N, the magnetic pole surface of the second magnetic element 3 facing the cover plate 6 is S, the magnetic pole surface of the first magnetic element 2 facing away from the cover plate 6 is S, and the magnetic pole surface of the second magnetic element 3 facing away from the cover plate 6 is N; alternatively, assuming that the magnetic pole face of the first magnetic element 2 facing the cover plate 6 is S, the magnetic pole face of the second magnetic element 3 facing the cover plate 6 is N, and the magnetic pole face of the first magnetic element 2 facing away from the cover plate 6 is N, the magnetic pole face of the second magnetic element 3 facing away from the cover plate 6 is S. The advantage of this is that when the first magnetic part 2 is attracted to the side close to the electronic device, a strong magnetic attraction can be formed with the second magnetic part 3, so that a more stable attraction effect is achieved.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A vehicle-mounted bracket, characterized by comprising:

the support comprises a support seat, wherein one end of the support seat is provided with a connecting part, and the other end of the support seat is provided with a first accommodating groove and a second accommodating groove;

the first magnetic piece is movably arranged in the first accommodating groove and can move in the depth direction in the first accommodating groove;

the second magnetic piece is fixedly arranged in the second accommodating groove;

the reset mechanism is arranged in the first accommodating groove and is used for resetting the first magnetic piece;

and the cover plate is covered on the first accommodating groove and the second accommodating groove.

2. The vehicle-mounted bracket according to claim 1, wherein the reset mechanism is an elastic member, one end of the elastic member is connected to the bottom of the first accommodating groove, the other end of the elastic member is connected to the first magnetic member, and the elastic member is in a stretched state when the first magnetic member moves towards a direction away from the bottom of the first accommodating groove under the action of an external force.

3. The vehicle-mounted bracket of claim 1, wherein the reset mechanism is a third magnetic member, the third magnetic member is disposed at a bottom of the first accommodating groove, and the third magnetic member is magnetically attracted to the first magnetic member.

4. The vehicle-mounted bracket of claim 3, wherein a magnetic attraction force between the third magnetic member and the first magnetic member is smaller than a magnetic attraction force between the first magnetic member and an object magnetically attracted on the bracket base.

5. The vehicle mount of claim 1, wherein the second receiving slot is proximate an edge of the mount base relative to the first receiving slot.

6. The vehicle-mounted bracket according to claim 1, wherein a buffer pad is arranged between the first magnetic member and the cover plate, and/or a buffer pad is arranged between the first magnetic member and a bottom of the first accommodating groove.

7. The vehicle mount according to any one of claims 1 to 6, wherein the first magnetic member is an annular magnetic member, and the first accommodation groove is an annular accommodation groove; or,

the first magnetic pieces are arranged in a plurality, and the first accommodating grooves are correspondingly arranged in a plurality and are annularly distributed on the support seat at intervals.

8. The vehicle mount of any of claims 1-6, wherein a pole of the first magnetic member facing the cover plate is opposite a pole of the second magnetic member facing the cover plate, and a pole of the first magnetic member facing away from the cover plate is opposite a pole of the second magnetic member facing away from the cover plate.

9. The vehicle mount of any of claims 1-6, wherein the magnetic force of the second magnetic member is less than the magnetic force of the first magnetic member.

10. The vehicle-mounted bracket according to any one of claims 1 to 6, wherein the second magnetic member is an annular magnetic member, and the second accommodating groove is an annular accommodating groove; or,

the second magnetic pieces are arranged in a plurality, and the second accommodating grooves are correspondingly arranged in a plurality and are annularly distributed on the support seat at intervals.